Conveners
Light new particles
- Chair: Alexey Lokhov (KIT)
Exact discrete symmetries, if non-linearly realized, can protect a given theory against ultraviolet sensitivity. Quadratic divergences can cancel exactly, while the lightest scalars stemming from spontaneous symmetry breaking are massive without breaking the symmetry. This is at variance with non-linearly realized continuous symmetries, for which the masses of pseudo-Goldstone bosons require...
Extensions of the Standard Model (SM) with new Abelian
gauge groups allow for kinetic mixing between the new gauge bosons and the
hypercharge gauge boson, resulting in mixing with the photon. In many models the
mixing with the hypercharge gauge boson captures only part of the kinetic mixing
term with the photon, since the new gauge bosons can also mix with the neutral
component of the...
We investigate the effect of quantum loops on the theory of
axionlike particles (ALPs) coupled to electrons. Contrary to some statements in the
recent literature, the effective ALP-photon coupling induced by an electron loop
can be sizeable in the plasma of a supernova. We define a general effective
coupling that depends on the kinematics of the specific process in which an ALP
scatters,...
